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HL7548 Datasheet(PDF) 33 Page - List of Unclassifed Manufacturers |
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HL7548 Datasheet(HTML) 33 Page - List of Unclassifed Manufacturers |
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33 / 53 page  4116369 Rev 9.0 September 04, 2017 33 Product Technical Specification Detailed Interface Specifications Pad Number Signal Name I/O I/O Type Description 23 32K_CLKOUT O 1.8V 32.768kHz Digital Clock output Enabling or disabling the clock out feature can be done using AT commands. For more information about AT commands, refer to documents [2] AirPrime HL7518 and HL7548 AT Commands Interface Guide and [3] AirPrime HL7588 AT Commands Interface Guide. 3.14. PCM Note: This interface is only available on the HL7588. The Digital Audio (PCM) Interface allows connectivity with standard audio peripherals. It can be used, for example, to connect an external audio codec. The programmability of this interface allows addressing a large range of audio peripherals. The signals used by the Digital Audio Interface are as follows: • PCM_SYNC: The frame synchronization signal delivers an 8 kHz/16 kHz frequency pulse that synchronizes the frame data in and the frame data out. • PCM_CLK: The frame bit clock signal controls data transfer with the audio peripheral. • PCM_OUT: The frame “data out” relies on the selected configuration mode. • PCM_IN: The frame “data in” relies on the selected configuration mode. The PCM interface is a high speed full duplex interface that can be used to send and receive digital audio data to external audio ICs. The Digital Audio Interface also features the following: • PCM master or slave • 16 bits data word length, linear mode • MSB first • Configurable PCM bit clock rate on 256kHz, 384kHz, 512kHz, 768kHz or 1024kHz • Long frame sync The following table describes the pad description of the PCM interface. Table 23. PCM Interface Pad Description Pad Number Signal Name I/O Description 33 PCM_OUT O PCM data out 34 PCM_IN I PCM data in 35 PCM_SYNC I/O PCM sync out 36 PCM_CLK I/O PCM clock Refer to the following table for the electrical characteristics of the digital audio interface. |
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